The residue of 1, 2, 4-trichlorbenzene, used as a carrier for the dyeing of the polyester fibers has been examined when it gradually vaporizes and elutes from an inside or surface of polyester dyed cloth. The correlation has also been studied between the quantity of the residue and the degree of skin irritation by the Evaluation Method (the Kawai's Method) of skin patch test based on the microscopical observation.
The result has revealed that because of the variation in the thrmochemical combination, 1, 2, 4-trichlorbenzene is relatively unelutable from an inside of the fiber at a low temperature, even though it is relatively vaporizable compared with other carriers.
Through the skin irritation test by the Kawai's Method, the correlation between the quantity of the residue contained and skin irritation was observed. As the quantity of the residuedecreased, skin irritation also decreased, i, e., positive at 10, 000 ppm and almost negative at 860-2, 000 ppm. The fact that the degree of skin irritation was the same at 860 and 0 ppm, has been assumed that the skin irritation by the carreer at less than 860 nom is almost undistinauishable from nhvsical irritation by nolvester cloth.

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The following six extensional properties were examined, i.e., (1) work done in stretching specimen to 20% in length, (2) energy loss, (3) maximum stress at 20% elongation, (4) Young's modulus, (5) recovery percentage and (6) resilience.
To investigate the differences between silk and other fibers, the extensional properties of knitted fabrics of other than silk fibers were also measured and the results were compared with those of the silk knitted fabrics. The data were analyzed by the method of“Multivariate Analysis”, i. e., Principal Component Analysis (PCA) . The results obtained were as follows:
1) The recovery percentage of the silk knitted fabrics was slightly less than that of knitted fabrics of wool or acrylic spun yarns, and showed close resemblance to that of knitted fabrics of cotton or acrylic filament yarns.
2) The resilience of the silk knitted fabrics was less than that of knitted fabrics of wool, acrylic spun or filament yarns, and showed close resemblance to that of cotton knitted fabrics.
3) Variables may be classified into three groups by PCA.
Group 1 : Variables of“hardness”or “rigidity”comprising work, energy loss, Young's modulus and maximum stress at 20 % elongation.
Group 2: Variables of“recovering”or“elasticity”comprising recovery percentage and resilience.
Group 3: Variables of“thickness”comprising thickness only.

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